diff --git a/sbf-cpp/Genders.cpp b/sbf-cpp/Genders.cpp
index b295140..241411c 100644
--- a/sbf-cpp/Genders.cpp
+++ b/sbf-cpp/Genders.cpp
@@ -7,6 +7,21 @@ namespace SBF {
 using std::string;
 using std::vector;
 
+const int kGendersCount = 5;
+const std::string kGenderMaleLabel = "Male";
+const std::string kGenderFemaleLabel = "Female";
+const std::string kGenderTransMaleLabel = "Trans-Male";
+const std::string kGenderTransFemaleLabel = "Trans-Female";
+const std::string kGenderNonBinaryLabel = "Non-Binary";
+const std::string kGenderLabels[] = {
+    "",
+    kGenderMaleLabel,
+    kGenderFemaleLabel,
+    kGenderTransMaleLabel,
+    kGenderTransFemaleLabel,
+    kGenderNonBinaryLabel,
+};
+
 string GetGenderLabel(int genderId) {
   if (genderId > 0 && genderId <= kGendersCount) {
     return kGenderLabels[genderId];
diff --git a/sbf-cpp/Genders.h b/sbf-cpp/Genders.h
index b3cc266..b33ad6c 100644
--- a/sbf-cpp/Genders.h
+++ b/sbf-cpp/Genders.h
@@ -16,24 +16,10 @@
  */
 namespace SBF {
 const int kGenderMaleId = 1;
-const std::string kGenderMaleLabel = "Male";
 const int kGenderFemaleId = 2;
-const std::string kGenderFemaleLabel = "Female";
 const int kGenderTransMaleId = 3;
-const std::string kGenderTransMaleLabel = "Trans-Male";
 const int kGenderTransFemaleId = 4;
-const std::string kGenderTransFemaleLabel = "Trans-Female";
 const int kGenderNonBinaryId = 5;
-const std::string kGenderNonBinaryLabel = "Non-Binary";
-const int kGendersCount = 5;
-const std::string kGenderLabels[] = {
-    "",
-    kGenderMaleLabel,
-    kGenderFemaleLabel,
-    kGenderTransMaleLabel,
-    kGenderTransFemaleLabel,
-    kGenderNonBinaryLabel,
-};
 
 /// @brief Gets a gender label with a specific id.
 /// @param gender_id The id of the gender to return the label for.
diff --git a/sbf-cpp/Genders_test.cpp b/sbf-cpp/Genders_test.cpp
index 38a09cb..3e82ad0 100644
--- a/sbf-cpp/Genders_test.cpp
+++ b/sbf-cpp/Genders_test.cpp
@@ -14,6 +14,12 @@ using namespace Test;
 using namespace std;
 }  // End namespace
 
+const std::string kGenderMaleLabel = "Male";
+const std::string kGenderFemaleLabel = "Female";
+const std::string kGenderTransMaleLabel = "Trans-Male";
+const std::string kGenderTransFemaleLabel = "Trans-Female";
+const std::string kGenderNonBinaryLabel = "Non-Binary";
+
 TestResults test_GetGenderLabel() {
   return execute_suite<string, int>(make_test_suite(
       "SBF::GetGenderLabel",